A.20 B.200 C.2 D.0.2
A.一级品纯度≧96% B.一级品纯度≧97% C.一级品纯度≧98% D.一级品纯度≧98.5%
A.点缺陷 B.线缺陷 C.面缺陷
A.弹性变形 B.塑性变形 C.强化变形
A.-20℃ B.-50℃ C.70℃ D.-10℃
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